JP2010139838A - Image display device and driving method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remarkably improve accuracy in prediction of luminance deterioration as compared with the conventional manner by using an active matrix image display device employing organic EL (Electro Luminescence) elements. <P>SOLUTION: Regarding a constitution to correct image data gradation and to correct the luminance, the degradation amount of the luminance is predicted by an interpolation operation using the light reception results obtained by a plurality of light receiving elements based on luminance information obtained using a predetermined derivation function, accordingly, the luminance is predicted with the constitution simpler as compared with the conventional one. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display device and a driving method of the image display device, and can be applied to an active matrix image display device using a self-luminous element such as an organic EL (Electro Luminescence) element. The present invention is simpler than in the past by predicting the amount of deterioration of light emission luminance by interpolation calculation processing using light reception results of a plurality of light receiving elements based on luminance information obtained using a predetermined derivation function. The emission luminance is predicted with a simple configuration.

  In recent years, active matrix image display devices using organic EL elements have been actively developed. Here, the organic EL element is a current-driven self-luminous element in which light emission luminance is expressed by a multiplication value of light emission efficiency and drive current. An active matrix type image display device using an organic EL element has a pixel circuit formed by an organic EL element and a drive circuit that drives the organic EL element arranged in a matrix to form an image display unit that is an effective pixel region, A desired image is displayed on the image display unit.

  However, as the organic EL element is used for a long time, the light emission efficiency decreases. In addition, the organic EL element has gradation dependency on the rate of decrease in the luminous efficiency, and the higher the emission luminance, the faster the decrease in the luminous efficiency. Accordingly, in an image display device using an organic EL element, emission luminance decreases and chromaticity changes due to long-term use. In addition, when a still image having a high contrast is displayed for a long time, so-called burn-in occurs. Therefore, for example, Japanese Patent Application Laid-Open No. 2007-156044 discloses a configuration for preventing a decrease in light emission luminance.

  Here, according to the technique disclosed in Japanese Patent Application Laid-Open No. 2007-156044, a monitor organic EL element (hereinafter referred to as a dummy organic EL element) and a light receiving element are provided in a portion other than the image display unit. In this method, a decrease in light emission luminance in the dummy organic EL element is detected using a light receiving element. Further, using this detection result, the deterioration amount when the organic EL element is driven at each gradation is predicted. Further, using this prediction result, the light emission luminance of the organic EL element provided in the image display unit is predicted based on the gradation of the organic EL element provided in the image display unit. Further, the luminance of the image data is corrected by correcting the gradation of the image data based on the prediction result.

  That is, as shown in FIG. 5, the light emission luminance y of the organic EL element when light is emitted at a predetermined gradation L can be expressed by the following equation. Here, t is the light emission time. G (L, Lo) is a function for obtaining a deterioration rate when light is emitted at gradation L from a decrease rate of light emission luminance when light is emitted at gradation Lo. It is a degradation rate conversion function showing dependency. Accordingly, the deterioration rate conversion function g (L, Lo) increases in value as the gradation L increases. y = f (t, Lo) is a reference deterioration curve used for correcting the light emission luminance, and is hereinafter referred to as a master deterioration curve. Further, y = f (t, L) is referred to as a gradation curve of gradation L. In FIG. 7, the light emission luminance y is shown normalized.

The technique disclosed in Japanese Patent Application Laid-Open No. 2007-156044 is based on the relationship of the formula (1), and the amount of deterioration of the emission luminance (1-f (t, Lo)) detected by the dummy organic EL element is The deterioration rate conversion function g (L, Lo) is multiplied to predict the emission luminance deterioration amount (1-f (t, L)) when the organic EL element is driven at each gradation. Further, the prediction results are selected and accumulated according to the gradation of the organic EL element provided in the image display unit, and the light emission luminance in each pixel is predicted.
JP 2007-156044 A

  However, the technique disclosed in Japanese Patent Application Laid-Open No. 2007-156044 is based on the premise that a master deterioration curve exists. Eventually, it is necessary to record and hold the master deterioration curve. Therefore, there is a problem that the configuration becomes complicated.

  The present invention has been made in consideration of the above points, and intends to propose an image display device and a driving method of the image display device that can predict the light emission luminance with a simpler configuration than conventional ones. .

  In order to solve the above problems, the invention of claim 1 is directed to an image display panel that displays image data by a self-luminous element, a plurality of light receiving elements that receive light emitted from the image display panel, and a plurality of light receiving elements. The present invention is applied to an image display device having a luminance correction unit that processes a light reception result and corrects the gradation of the image data. Here, the luminance correction unit processes the image data with a derivation function, and calculates a gradation or a driving time when the self-luminous element is driven at a constant gradation for a certain period of time; A correction amount determination unit configured to perform interpolation calculation processing on the light reception results of the plurality of light receiving elements at the gradation or driving time calculated by the luminance information calculation unit, and to set a correction amount of the image data.

  The invention according to claim 7 is applied to a driving method of an image display device including an image display panel that displays image data by a self-luminous element, and a plurality of light receiving elements that receive light emitted from the image display panel. Here, there is a luminance correction step of processing light reception results of the plurality of light receiving elements to correct the gradation of the image data. The luminance correction step processes the image data with a derivation function, and Luminance information calculation step for calculating gradation or driving time when the light emitting element is driven at a constant gradation for a certain period of time, and the gradation or driving calculated in the luminance information calculation step for the light reception results of the plurality of light receiving elements. A correction amount determining step for performing interpolation calculation processing in time and setting a correction amount of the image data.

  According to the configuration of claim 1 or 7, the gradation or driving time when the self-luminous element is driven at a constant gradation for a certain period of time is calculated from the image data using a derivation function. The correction amount of the image data can be set by interpolating the light reception results of the plurality of light receiving elements using time. Therefore, even if the master deterioration curve is not recorded and held, the decrease in the emission luminance can be corrected, and the emission luminance can be predicted with a simpler configuration than in the past.

  According to the present invention, it is possible to predict the light emission luminance with a simpler configuration than in the past.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. The description will be given in the following order.
1. First Embodiment 2. FIG. Second Embodiment 3. FIG. Third embodiment 4. Modification <First Embodiment>
[Configuration of the embodiment]
FIG. 2 is a diagram illustrating the image display apparatus according to the first embodiment of the present invention. The image display device 1 displays a desired image by driving the image display panel 3 with image data D1 input via the luminance correction unit 2.

  Here, in the image display panel 3, the pixel circuits 5 are arranged in a matrix to form the image display unit 4 that is an effective pixel region. The pixel circuit 5 is formed by an organic EL element 6 that is a self-luminous element and a drive circuit that drives the organic EL element 6. Further, the image display panel 3 is provided with a plurality of dummy pixel circuits 5DA and 5DB at portions other than the image display section 4, and the dummy pixel circuits 5DA and 5DB are provided with a plurality of dummy organic EL elements 6DA and 6DB, respectively. . In this embodiment, two organic EL elements 6DA and 6DB are applied to the plurality of dummy organic EL elements 6DA and 6DB.

  Here, as shown in FIG. 2B by taking a cross section along the line AA, the dummy organic EL elements 6DA and 6DB are formed so as to emit outgoing light to the back side of the image display panel 3. . More specifically, in this image display panel 3, the organic EL element 6 of the image display unit 4 is created by the top emission method, whereas the dummy organic EL elements 6DA and 6DB are created by the bottom emission method. The The dummy pixel circuits 5DA and 5DB and the organic EL elements 6DA and 6DB are created in the same way as the pixel circuit 5 of the image display unit 4 except that the bottom emission method is used. In FIG. 2, reference numerals L1, L1DA, and L1DB denote emitted lights from the organic EL elements 6, 6DA, and 6DB.

  In the image display panel 3, light receiving elements 7 </ b> A and 7 </ b> B that receive the emitted light L <b> 1 </ b> DA and L <b> 1 </ b> DB of the dummy organic EL elements 6 </ b> DA and 6 </ b> DB are disposed on the back side of the image display panel 3. The light receiving elements 7A and 7B are, for example, photodiodes, and are disposed by bonding using, for example, a transparent adhesive. The image display device 1 drives the dummy organic EL elements 6DA and 6DB by the luminance correction unit 2, and measures the light emission luminance of the organic EL elements 6DA and 6DB at a constant time interval based on the light reception results of the light receiving elements 7A and 7B. To do. Further, based on the measured light emission luminance, the luminance correction unit 2 corrects the gradation of the image data D1 and outputs it to the image display panel 3 to correct the decrease in the light emission luminance.

[Detailed configuration of brightness correction unit]
FIG. 1 is a block diagram showing a detailed configuration of the luminance correction unit 2. Note that the luminance correction unit 2 includes, for example, arithmetic processing means for executing a luminance correction program and peripheral circuits of the arithmetic processing means. Therefore, each block of the luminance correction unit 2 shown in FIG. 1 is a functional block configured by the arithmetic processing means and the peripheral configuration of the arithmetic processing means.

  The correction unit 11 multiplies the image data D1 by the correction amount for each pixel determined by the correction amount determination unit 12, and corrects the gradation of the image data D1 to generate image data D3. The correction unit 11 time-division multiplexes the image data D3 and the drive data D2A and D2B output from the dummy pixel control unit 14 and outputs them to the image display panel 3. Instead of the image data D3 and the drive data D2A and D2B being time-division multiplexed and input to the image display panel 3, the image data D3 and the drive data D2A and D2B may be individually input to the image display panel 3.

  The image display panel 3 drives the pixel circuit 5 of the image display unit 4 with the image data D3. The drive data D2A and D2B are input to the dummy pixel circuits 5DA and 5DB, respectively, and the dummy organic EL elements 6DA and 6DB are caused to emit light by the drive data D2A and D2B, respectively.

  In the luminance correction unit 2, the luminance measurement unit 13 processes the light reception results of the light receiving elements 7A and 7B, detects the light emission luminance of the dummy organic EL elements 6DA and 6DB, and outputs the detection result.

  The dummy pixel control unit 14 generates and outputs drive data D2A and D2B by feedback control based on the detection result of the luminance measurement unit 13, and causes the organic EL elements 6DA and 6DB to emit light with a constant light emission luminance. In this embodiment, the organic EL elements 6DA and 6DB have light emission luminances different from those of the organic EL elements 6DA and 6DB. For example, the light emission corresponding to the highest gradation and the intermediate gradation of the image data D3. Set to brightness. Further, the dummy pixel control unit 14 temporarily stops the feedback control at a predetermined measurement cycle, and outputs drive data D2A and D2B for light emission luminance measurement.

[Prediction of deterioration amount]
Here, in this embodiment, the luminance correction unit 2 detects luminance information by a calculation process using a derivation function. Here, the derived function is a gradation in which the deterioration amount of the organic EL element 6 that emits light with various gradations and light emission times is equalized by driving the organic EL element 6 with a constant gradation for a certain period of time. Alternatively, it is a function that defines the driving time from the driving history of the organic EL element 6. Therefore, the derivation function is a function that indicates the deterioration amount of the organic EL element 6 provided in the image display unit 4 in terms of gradation or driving time when the organic EL element 6 is driven at a constant gradation for a certain period of time. It is.

  In this embodiment, with this derivation function, the pixel to be processed is driven at a constant gradation for the same time as the dummy organic EL elements 6DA and 6DB, and the deterioration amount of the organic EL element 6 is deteriorated. A certain gradation with the same amount is detected as luminance information. Further, using the luminance information, the light reception results of the light receiving elements 7A and 7B are processed to detect the light emission luminance of each pixel. Further, the image data D1 is corrected by detecting the deterioration amount from the detected light emission luminance.

  More specifically, in this embodiment, as shown by the following equation, a function that weights and averages the gradation of the image data D3 using the deterioration rate conversion function as a weighting coefficient is applied to the derivation function. Here, the deterioration rate function is a function indicating the gradation dependency of the deterioration rate. Here, h (L (i), Lo) is a deterioration rate conversion function of the gradation L (i) with respect to the gradation Lo. In the organic EL element, since the deterioration rate of the light emission luminance increases as the light emission luminance increases, the value of the deterioration rate conversion function h (L (i), Lo) increases as the gradation L (i) increases. Function. As the degradation rate conversion function h (L (i), Lo), for example, a linear function, a quadratic function, a power function, or the like in which the ratio of the gradation L (i) to the gradation Lo is set as a parameter can be applied. L (i) is the gradation of the corresponding pixel of the image data D3, and t (i) is the display time at the gradation L (i). When h (L (i), Lo) = 1, equation (2) simply calculates the average value of the gradation L (i).

  Here, as shown in FIG. 3, the light emission luminances of the dummy organic EL elements 6DA and 6DB at a predetermined time to are assumed to be yo = f (to, Lo) and y1 = f (to, L1). Here, the luminance information Lavo of the dummy organic EL element 6D is Lo / to from the equation (2). On the other hand, the luminance information Lav1 of the dummy organic EL element 6DB can be expressed by L1 × h (L1, Lo) / to from the equation (2).

  Therefore, in this case, the gradation information Lav of the processing target pixel is obtained from the expression (2) with respect to the light emission luminances yo and y1 of the organic EL elements 6DA and 6DB having the gradation information Lavo and Lav1, respectively. Therefore, in this case, as shown by the following equation, the light emission luminance yx of the processing target pixel can be derived using a predetermined interpolation function i (to, L (i), Lo, L1). For the interpolation function i (to, L (i), Lo, L1), for example, a linear function, a quadratic function, or the like that interpolates and extrapolates the emission luminances yo and y1 based on the gradation information Lav is applied. Can do.

  Based on this prediction principle, the luminance information storage unit 17 stores and holds the luminance information Lav of the corresponding pixel calculated immediately before for each pixel, thereby recording the driving history of each pixel by the luminance information. Hold.

  The luminance information calculation unit 16 corrects the corresponding luminance information Lav stored in the luminance information storage unit 17 with the gradation L (i) of the image data D3, and executes the calculation process of equation (2).

  The correction amount determination unit 12 detects the light emission luminance yx by performing the calculation process of the expression (3) using the luminance information Lav calculated by the luminance information calculation unit 16 and the light reception results yo and y1 of the light receiving elements 7A and 7B. The correction value is determined and output based on the detection result.

[Operation of the embodiment]
In the above configuration, in the image display device 1 (FIG. 2), sequentially input image data D1 is input to the image display panel 3 via the luminance correction unit 2. In the image display panel 3, the light emission luminance of each organic EL element 6 constituting the image display unit 4 is set by the image data D3 input through the luminance correction unit 2, thereby displaying an image based on the image data D1. .

  However, the higher the emission luminance of the organic EL element 6 is, the lower the luminous efficiency is as it is used for a long time. As a result, in the image display device, a decrease in emission luminance, a change in chromaticity, and burn-in occur.

  Therefore, in the image display device 1, dummy organic EL elements and light receiving elements are provided in parts other than the image display unit 4 of the image display panel 3, and the emission luminance of the organic EL element 6 provided in the image display panel 3 is reduced. Is monitored by the luminance correction unit 2. Further, based on the monitor result, the luminance correction unit 2 corrects the gradation of the image data D1 used for driving each organic EL element 6, thereby preventing a decrease in light emission luminance, chromaticity variation, and burn-in.

  However, if the master deterioration curve is created and the amount of deterioration is obtained by the conventional method (the method disclosed in Japanese Patent Application Laid-Open No. 2007-156044), a configuration for recording and holding the master deterioration curve is required. The configuration of the display device becomes complicated.

  Therefore, in the image display device 1, a plurality of dummy organic EL elements 6DA and 6DB are provided on the image display panel 3, and the dummy organic EL elements 6DA and 6DB are driven with different gradations. In the image display device 1, the light emission luminances yo and y1 of the dummy organic EL elements 6DA and 6DB are detected using the light receiving elements 7A and 7B, respectively. In the image display device 1, the luminance information calculation unit 16 processes the gradation L (i) of the image data D <b> 3 by the derivation function (equation (2)), and the deterioration amount of each organic EL element 6 of the image display unit 4 is calculated. On the other hand, a gradation Lav having the same amount of deterioration is detected as luminance information by driving the organic EL element 6 with a certain gradation for a certain period of time. Further, the light reception results yo and y1 of the light receiving elements 7A and 7B are subjected to an interpolation calculation process based on the luminance information Lav (Equation (3)), and the deterioration amount of each pixel is detected.

  As a result, the image display apparatus 1 can predict the deterioration amount of each pixel without having to record and hold the master deterioration curve one by one, and can correct a decrease in light emission luminance with a simple configuration. .

[Effect of the embodiment]
According to the above configuration, the deterioration amount of the light emission luminance is predicted by the interpolation calculation processing using the light reception results of the plurality of light receiving elements based on the luminance information obtained using the predetermined derivation function. Thus, the emission luminance can be predicted with a simple configuration.

  More specifically, by using a derivation function that weights and averages the gradation of the image data with the deterioration rate conversion function, the image data is processed with this derivation function by processing the gradation of the image data and performing an interpolation calculation process. The light emission luminance can be predicted with a simpler configuration than in the past.

  In addition, a plurality of dummy self-luminous elements are arranged in a region other than the image display section, and the light emission brightness of the plurality of dummy self-luminous elements is interpolated to obtain a light reception result with a desired gradation with a simple configuration. The emission luminance can be predicted with a simpler configuration than in the past.

  In addition, since the self-luminous element is an organic EL element, it can be applied to a flat display device using the organic EL element to prevent luminance deterioration, chromaticity change, and burn-in.

  In addition, the dummy self-emitting element emits outgoing light to the back side of the image display panel, and the light receiving element is arranged on the back side of the image display panel, thereby simplifying the configuration of the housing that holds the image display panel. Can do.

<Second Embodiment>
In the image display device of this embodiment, a derivation function of the following equation is applied instead of the derivation function of equation (2). The image display apparatus according to this embodiment is configured in the same manner as the above-described first embodiment except that the configuration relating to the derivation function is different. Therefore, the following description will be made by appropriately using the configuration of FIG.

  Here, 1 / g (L (i), Lo) is a function indicating the gradation dependency of the time required for the deterioration of the unit deterioration amount, and the deterioration amount of the gradation L (i) due to the display time t (i). Is a deterioration rate conversion function for converting the above into the display time of the reference gradation Lo. Here, the deterioration rate conversion function 1 / g (L (i), Lo) is a function that increases in value as the gradation L (i) increases. For the deterioration rate conversion function 1 / g (L (i), Lo), for example, a linear function, a quadratic function, a power function, or the like in which the ratio of the gradation L (i) to the gradation Lo is set as a parameter may be applied. it can. In this embodiment, the luminance information tav is detected by weighted addition in which the deterioration rate conversion function 1 / g (L (i), Lo) is set as a weighting coefficient.

  Therefore, in this embodiment, the luminance information storage unit 17 stores and holds the luminance information tav shown in the equation (4).

  The luminance information calculation unit 16 uses the luminance information tav immediately before stored in the luminance information storage unit 17 to execute the calculation process of the equation (4) using the image data D3, and calculates the latest luminance information tav.

  The correction amount determination unit 12 executes the arithmetic processing of the formula (4) by applying the gradations Lo and L1 of the drive data D2A and D2B at the time of feedback control and the drive time of the dummy organic EL elements 6DA and 6DB. Luminance information tavLo and tavL1 are detected. Similarly to the first embodiment, the reference luminance information tavLo and tavL1, the luminance information tav obtained by the arithmetic processing of the equation (4), and the interpolation calculation processing by the light emission luminance yo and y1 of the organic EL elements 6DA and 6DB. Thus, the light emission luminance yx of the pixel to be processed is detected. Also, a correction value is determined from the light emission luminance yx. The calculation processing in the correction amount determination unit 12 can be expressed by the following equation by comparison with the equation (3).

  According to the above configuration, the weighting is performed using the deterioration rate function indicating the gradation dependency of the time required for the deterioration of the unit deterioration amount of the light emission luminance, and the derivation function for totalizing the display time for each gradation of the image data is used. Even in this case, the same effect as the first embodiment can be obtained.

<Third Embodiment>
In the image display device of this embodiment, the gradation of the dummy organic EL element 6DA and / or 6DB is varied. The image display apparatus according to this embodiment is configured in the same manner as in the first embodiment, except that the configuration related to the gradation related to the driving of the dummy organic EL element 6DA is different. Therefore, the following description will be made by appropriately using the configuration of FIG.

  Here, when changing the gradation, for example, the gradation may be periodically changed according to a certain pattern, or the gradation may be changed randomly, thereby changing the gradation regardless of the image data D1. In this case, since the light emission luminance can be measured in a state close to the actual image display state, the deterioration amount can be predicted with high accuracy.

  Alternatively, the average gradation of the image data D1, the gradation of the specific pixel of the image display unit 4, etc. are set, and the gradations of the dummy organic EL elements 6DA and 6DB are varied according to the image data D1. Also good. In this case, since the gradations of the dummy organic EL elements 6DA and 6DB can be set according to the image data to be actually displayed, the deterioration amount can be accurately predicted.

  According to this embodiment, even if the gradation of the dummy organic EL element is varied, the same effect as in the first embodiment can be obtained.

<Fourth embodiment>
In the image display apparatus according to this embodiment, a light receiving element is disposed in the vicinity of the image display unit, and detects the light emission luminance of the organic EL element of the image display unit instead of the organic EL element of the dummy pixel. The image display apparatus according to this embodiment is configured in the same manner as the first or second embodiment described above except that the configuration relating to the light receiving element is different.

  For this reason, the image display device switches the operation mode, for example, when the image display device is turned on, and displays a predetermined pattern for measuring the deterioration amount of the light emission luminance on the image display unit. The light emission luminances yo and y1 as the correction reference are detected from the light reception result of the predetermined pattern. In this case, the luminance can be detected stably at a specific gradation.

  Alternatively, the gradation of the image data may be monitored, and when the image data has a specific gradation, the emission luminance may be detected to detect the correction emission luminances yo and y1.

  Alternatively, data indicating the gradation dependency of the light emission luminance is recorded and held, and the light emission luminance detected through the light receiving element is corrected by this data to detect the correction light emission luminances yo and y1. May be.

In this embodiment, it is possible to predict the deterioration of the light emission luminance with higher accuracy by detecting the light emission luminance of the image display unit instead of the dummy pixel.
<Modification>
In the first and second embodiments described above, the case where the organic EL element of the image display unit and the organic EL element of the dummy pixel are formed by the top emission method and the bottom emission method has been described. However, the present invention is not limited to this, and the organic EL element of the image display unit and the organic EL element of the dummy pixel may be created by the bottom emission method and the top emission method.

  If the configuration of the housing in which the image display panel is arranged can be simplified practically, for the dummy pixel organic EL element, both the upper and lower electrodes sandwiching the organic EL layer are made of transparent electrodes, The emitted light may be emitted to both the emission surface and the back surface. Moreover, you may produce both the organic EL element of an image display part, and the organic EL element of a dummy pixel by a top emission system or a bottom emission system.

  Furthermore, in the above-described embodiment, the case where the light receiving element is arranged on the back surface of the image display panel has been described. However, the present invention is not limited thereto, and may be arranged in the image display panel.

  In the first to third embodiments described above, the case where the gradation is corrected by inputting the image data whose gradation is corrected by the correction unit to the luminance information calculation unit has been described. However, the present invention is not limited to this, and the gradation may be corrected by inputting image data before being input to the correction unit to the luminance information calculation unit. In this case, in the first and second embodiments, the emission luminance feedback control by the dummy pixel control unit 14 is performed so as to correspond to the detection of the deterioration amount by the image data before the gradation is corrected by the correction unit. May be canceled.

  In the above-described embodiment, the case where the correction value is set for each pixel has been described. However, the present invention is not limited to this, and can be widely applied to a case where a correction value is set for each of a plurality of pixels, a case where a correction value is set in common to all screens of an image display panel, and the like.

  In the above-described embodiment, the case where the correction amount is set for each frame has been described. However, the present invention is not limited to this, and the correction amount may be set in units of a plurality of frames, for example, by calculating luminance information with an average luminance of a plurality of frames.

  In the first and second embodiments described above, the case where the light emission luminance of all the pixels provided in the image display panel is corrected based on the light reception results of the two dummy pixels has been described. However, the present invention is not limited to this, and the present invention can be widely applied to a case where the image display panel is divided into predetermined regions and dummy pixels are provided for each region to correct the light emission luminance. Alternatively, the present invention can be widely applied to a case where dummy pixels are provided for each color and the light emission luminance of each color is corrected by the light reception result of the corresponding dummy pixels.

  In the above-described embodiment, the case where the light emission luminance of the corresponding region is corrected by the light reception results of the two light receiving elements has been described. However, the present invention is not limited to this, and the light emission luminance of the corresponding region may be corrected by the light reception results of three or more light receiving elements.

  Further, in the above-described embodiment, the case where the image display panel is configured by the self-luminous element by the organic EL element has been described. However, the present invention is not limited to this, and the case where the image display panel is configured by various self-luminous elements. Can be widely applied.

  In the above-described embodiments, the configuration of a suitable image display device has been described. However, the present invention is not limited to this configuration, and the image display device may be configured by combining the above-described configurations as necessary.

  The present invention can be applied to an active matrix image display device using a self-luminous element such as an organic EL (Electro Luminescence) element.

It is a block diagram which shows the detailed structure of the image display apparatus of the 1st Embodiment of this invention. It is a figure which shows the image display apparatus of the 1st Embodiment of this invention. It is a characteristic curve figure which shows the time change of the light-emitting luminance in each gradation. It is a characteristic curve figure with which it uses for description of the detection of deterioration amount. It is a characteristic curve figure with which it uses for description of the detection of the deterioration amount by a conventional method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image display apparatus, 2 ... Brightness correction part, 3 ... Image display panel, 6, 6DA and 6DB ... Organic EL element, 7A and 7B ... Light receiving element, 12 ... Correction amount determination part, 16 ... ... Brightness information calculator

Claims (7)

An image display panel for displaying image data by a self-luminous element;
A plurality of light receiving elements for receiving light emitted from the image display panel;
A brightness correction unit that processes the light reception results of the plurality of light receiving elements and corrects the gradation of the image data;
The brightness correction unit
A luminance information calculation unit that processes the image data with a derivation function and calculates a gradation or a driving time when the self-luminous element is driven at a constant gradation for a certain period of time;
An image display apparatus comprising: a correction amount determination unit configured to perform interpolation calculation processing on the light reception results of the plurality of light receiving elements with the gradation or driving time calculated by the luminance information calculation unit, and to set a correction amount of the image data. The derivation function is
The image display apparatus according to claim 1, wherein the image data display device is a function that weights and averages the gradation of the image data using a deterioration rate conversion function that indicates gradation dependency of a deterioration rate of light emission luminance. The derivation function is
The image according to claim 1, wherein the display time for each gradation of the image data is aggregated by weighting using a deterioration rate function indicating gradation dependency of a time required for deterioration of the unit deterioration amount of light emission luminance. Display device. The image display panel is
The self-light-emitting elements are arranged in a matrix to form an image display unit, and a plurality of dummy self-light-emitting elements are arranged in a portion other than the image display unit,
The plurality of light receiving elements are:
The image display device according to claim 1, wherein each of the dummy light-emitting elements is a light-receiving element that receives light emitted from the dummy self-light-emitting element. The image display apparatus according to claim 4, wherein the self-luminous element is an organic EL element. The dummy self-luminous element is
Emission light is emitted to the back side of the image display panel,
The image display device according to claim 4, wherein the light receiving element is disposed on a back side of the image display panel. An image display panel for displaying image data by a self-luminous element;
A driving method of an image display device comprising a plurality of light receiving elements for receiving light emitted from the image display panel,
A brightness correction step of processing the light reception results of the plurality of light receiving elements to correct the gradation of the image data;
The brightness correction step includes
Luminance information calculation step of processing the image data with a derivation function and calculating the gradation or driving time when the self-luminous element is driven at a constant gradation for a certain period of time;
A correction amount determining step of performing interpolation calculation processing on the light reception results of the plurality of light receiving elements at the gradation or driving time calculated in the luminance information calculating step, and setting a correction amount of the image data; Method.

Images